Non-arcing commutating switch device



L. PAULERO.

NON-ARCING COMMUTATING SWITCH DEVICE.

APPLICATlON FILED MAR. 14, 1919.

1,395,290. Patented Nov. 1, 1921,

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APPUCATION FILED MAR 14, 1919- Patented Nov. 1, 1921.

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LOUIS YAULERO, OF PETERSBURG, VIRGINIA, ASSIGNOR TO AMERICAN ELECTRIC TOOL COMPANY, INCORPORATED, OF PETERSBURG, VIRGINIA, A CORPORATION OF VIRGINIA.

NON-ARCING COMMUTATING SWITCH DEVICE.

Specification of Letters Patent.

Patented Nov. 1, 1921.

Application filed March 14, 1919. Serial No. 282,605.

To all whom it may concern:

Be it known that I, LOUIS PAULERO, a citizen of the United States, and a resident of Petersburg, in the county of Dinwiddie and State of Virginia, have invented certain new and useful Improvements in Non- Arcing Commutating Switch Devices, of which the following is a specification.

My invention relates to improvements in non-arcing switches, it being designed more particularly for use in connection with electric hammers, and it consists in the constructions, combinations, and arrangements herein described and claimed.

Theforemost object of the invention i to provide a novel non-arcing switch operated with relation to the operation of the arma ture shaft of a generator by means of which the two coils of an electric hammer are properly energized through the changing of the direction of the current of the generator by means of the switch making and brealc.

ing two electric circuits of opposite polarity, one for each hammer coil, in a manner to neutralize the residual magnetism in the hammer coils that otherwise might tend to cause the hammer plunger to stick, these various functions being accomplished by a simplified construction of the switch mecha- IllS v Another object of the invention is to provide a novel and efi'ectivemeans to prevent any material fall in voltage when the load is put on the generator, such as when an additional hammer or hammers is cut into the circuits, by the employment of a single set of series coils for compounding the genera tor and by including the series coils in the two circuits for the two hammer coils,

Other objects and advantages will appear in the following specification, reference being had to the accompanying drawings in which- Figure 1 is a diagram illustrating the wiring and circuits employed in connection with the improved non-arcing switch.

Fig. 2 is a similar diagrammatic view illustrating a slight modification hereinafter described,

Fig. 3 is a perspective View of the actuating member of the switch,

Fig. 4 is a detailed cross section taken substantially on the line 4-4 of Fig. 1, and

view of the actuating plication filed July 22, 1915, renewed September 29, 1919, Serial No. $25,154:. One of the important features of novelty in the present switch construction is, that the compounding of the generator field is obtained by the use of only one set of serie coils instead of two as in the former application. This simplifies the construction to a great extent in that a special winding for the generator does not have to be provided. Furthermore, any standard make of generator can be employed for driving the electric hammer, by the use of the improved switch, and precisely the same results are obtained with this arrangement as with that of the application above referred to.

Attention is now directed to the drawings. The armature 1 of the generator is in suit ably arranged electrical connection with the segments 8 and 1 of the commutator. The generator includes the series winding 5 and the shunt winding 6. The latter is joined to the brushes 7 and 8 which bear against the commutator.

Mounted on the generator shaft 9 is the switch sleeve 10. This sleeve is suitably fastened by the means 11. The contact cam 12 alternately closes the pairs of contacts 13, 14, and 15, 16 during its rotation with the shaft of the generator. As will presently appear, this action of alternately closing the pairs of contacts named, causes the energization of first the coil 17 of the electric hammer, and then the coil 18 so that the plunger 19 is moved back and forth for a purpose that is probably well understood.

There is a solid collector ring 20 on the sleeve 10, through which the current returns from the coils via the common return wire 21. A feed ring, consisting of an active segment 22 and a blank segment 23, is also mounted on the sleeve 10.

The course of the current for energizing the coil 17 in Fig. 1 is as follows: Current flows through armature segment 4, over wire 24: to the segment 22, through contact 25 and wire 26 to the feed conductor 27, over wire 28 to the series winding 5, over the upper portion of the wire 29 to the feed conductor 30, through the closed contacts 14, 13, over wire 31 to the feed conductor 30 at the other side of the break B, through coil 17, common return 21, collector ring 20, and over wire 32 to the commutator segment 3.

The coil 17 being thus energizer, draws the plunger 19 into the position shown. The foregoing action occurs upon the closure of the contacts 13, 14 by means of the cam 12. When the cam moves to the other side and closes the contacts 15, 16, the foregoing action is repeated, only the other set of wires and corresponding coils are energized. It

is to be observed in Fi 4 that the contact cam is or" such a construction that the respective pairs of contacts are soon closed one after the other, thus keeping up the continuous movement of the plunger.

The inclusion of the series winding 5 in alternate succession inthe two circuits for the hammer coils 18 and 19 maintainsthe proper voltage in the magnetizing circuits and prevents the'voltage from dropping when the load is 'put on the machine, the

winding 5 being so arranged and connected that it operates in addition to the shunt winding 6 to build up the field.

In the modification in Figs. Qand 5, instead of using the contact cam 12 for closing the respective pairs of contacts associated therewith, these contacts 13, i i and 15, 16 are arranged to-be bridgedby a bridge contact 33. As indicated in Fig. 5, this contact is segmental in shape and is suitably mounted by means of the insulating base 34.

This base being also segmental in shape,

completes the circle on which the respective contacts bear. i

In its other respects, the modified arrange ment isthe same in construction and operation as theform in Fig. 1, and to this end the same reference characters employed in Fig. 1 are applied to corresponding parts in Fig. 2. ltis clearly shown in Fig. 4 that the two pairs of contacts-associated with the contact cam l2 are suitably mounted, that is to say, the contacts 14, 16 are fixed, while the contacts 13, 15 have resilient supports 35.

spirit of the invention or the scope of the claims. 7

I claim: 7 i -1. The combination of a dynamo electric machine having a series exciting winding,

two hammer coils for moving a hammer in opposite directions, and. m ans for supply ing electrical impulses of opposite polarity from said machineto said coils in'alternate succession through two independent circuits 'each or" which includes said series exciting winding. i V V :2. The combination of a dynamoelectrlc machine having a serles'exciting W111d111 two hammer coils for moving, a hammer in opposite directions, and means tor'su'pplying electrical impulses of opposite polarity from said machine to said coils in alternate succession through two independent circuits each of which includes said series exciting winding, said means including circuit ma ing and breaking devices carried by the armature shaft of said machine.

' 3, The combination" of a dynamo electric machine having a series exciting winding, two hammer coils for moving a hammer in opposite directions, and means for supplying electrical impulses of opposite polarity from said machinelto said coils in alternate succession through two independent circuits each of which includes said'series exciting winding, said means including a device operated by the armaturershaft otsaid machine for making and breaking said circuits in alternate succession, and also including another device operated by the armature shaft of said machine for including said series exciting winding in said circuits in alternate succession.

I Lo Is rAULER i s of 

